- Location
- On the sofa. (Probably)
You don't need full sized trains. Using purpose built light rail cars where each car has a small battery and electric motor and a simple computer could give you a system that drove through the stargate in convoy automatically and then separated onto different tracks according to the cargo type or destination they carried. Since the rail cars don't have to travel more than 10 kilometers per side of the wormhole they wouldn't require very much energy storage and charging during loading/unloading would be easy.The problem would come though, that a train needs to be connected together for efficiency in acceleration and braking.
But it's shown in Atlantis that an entire vehicle needs to enter the wormhole before it will be transmitted (that episode where they first encounter the wraith's ancestor bug, and the puddle jumper gets stuck partway into the gate).
So all your train carriages would need to be decoupled before reaching the wormhole, and that's also assuming that the gate can actually handle something _longer_ than a standard size puddle jumper...
A full sized train wouldn't fit through a Stargate anyway so some sort of transhipment center would have to exist on each side. Why not use that and simply automate the entire train setup. Passengers could simply hop on to passenger cars and ride to their destination. The gate dials a planet automatically and the rail cars move on their own to their destination, having queued up beforehand. In 38 minutes you could move megatons of cargo in this way.
Each planet would have a transhipment center commensurate with the amount of cargo handled there, Earth would have one measured in tens of square kilometers but some little naquada mining colony might only send 20 rail cars a month and passenger cars might have to route through a transit hub planet to get back to earth (unless you want to wait for the once a month direct connection).
In all ways such a system would be superior to any ship based system, unless you have asgard teleporters and massive ships. But then again the rail setup would be very scalable and would probably be significantly cheaper per transported ton.
Edit: ooh, just had a thought. The transhipment center would easily double as a customs station to handle screening for drugs and stuff in case a lutian alliance type situation develops on a colony.
Edit2: scanners for the cargo could probably be loaned from the asgard or another advanced civilization much easier than weapons tech.
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